Display Information: Contact Service; The Phone Doesn't Register To The Network - Nokia Mobile Phones NSE-5 Series Service Manual

PAMS
Technical Documentation

4. Display Information: Contact Service

This fault means that software is able to run and thus the watchdog of
CCONT (N100) can be served.
Selftest functions are run when power is switched on and software is
started to excute from flash.
If any of selftests is failed, contact service information will be shown on
display.
5. The phone doesn't register to the network or phone doesn't make a call
If the phone doesn't register to the network or the phone doesn't make a
call, the reason could be either the baseband or the RF part.
The phone can be set to wanted mode by Wintesla service software and
determinate if the fault is in RF or in baseband part (RF interface
measurements).
The control lines for RF part are supplied both the System Asic
(MAD2;D300) and the RFI (Cobba_GJP; N200). MAD2Pr1 handles digital
control lines ( like synthena, TxP etc.) and Cobba handles analog control
lines (like AFC, TxC etc.).
The DSP software is constructed so that operation states of DSP
(MAD2Pr1) can be seen in external flag (DSPXF) output pin J308.
After power up, DSP signals all completed functions by changing the state
of the XF pin (see Figure 1–6, Figure 1–7, Figure 1–8 and Figure 1–9).
1
The states of DSP (MAD2) after power on
Issue 1 07/99
2 3
NSE–5
Troubleshooting
1. DSP initialization
done
2.Synchronization to
network done
3. Registrarition to
network done.
MAD2Pr1 pin D8
(DSPXF)
J308
Figure 6.
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